Burner assembly for gas furnaces



June 7, 1932. Y FRASER- I 1,862,182

BURNER ASSEMBLY FOR GAS FURNACES Filed March 8, 1930 3 Sheets-Sheet 1INVENTOR R.E'.F1-as er BY G M a 9 ATTORNEY June 7, 1932. R E FRASER1,862,182

BURNER ASSEMBLY FOR GAS FURNACES Filed March 8, 1950 5 Sheets- Sheet 2.

Q" a z- 25 if A it 5 0 if Q\ 5 C) 2 20 .9 15 17 f 15 26 9 'INVENTORR.EF2-aser BY QM Q M ATTORNEY June 7, 1932. FRASER 1,862,182

BURNER ASSEMBLY FOR GAS FURNACES Filed March 8, 1950 5 Sneets-Sheet 3zaa v INVENTOR RQEF IwZSeP Q QJ M ATTORNEY Patented June 7, 1932 UNITEDSTATES PATENT OFFICE.

RICHARD E. FRASER, STOCKTON, CALIFORNIA, ASSIGNOB OF ONE-HALF TO FRASERFURNACE COMPANY OFSDOCKTON, CALIFORIFIA, A CORPORATION BURNER ASSEMBLYroe GAS FURNACES This invention relates to gas furnaces such as are usedfor house heating furnaces, and particularly to the larger furnaces ofthat type shown in my copending application for patent, Serial No.320,332, filed November 19, 1928, which has resulted in Patent No.1,762,683, issued June 10, 1930.

The firing-box of a furnace of this type is quite deep compared to itswidth and it is customary to use a number of burners arranged in a rowand extending substantially the full depth of the firebox. If the burnerassembl is a fixed and non-removable unit it is a ard matter to make thesometimes necessary adjustments or replacements to the innermost burnerswithout practically dismantling the entire assembly. This of course isvery inconvenient and is a time taking procedure, and as a result, saidinnermost burners are frequently left in a state of poor adjustment ordisrepair, which of course does not give the furnace as a whole theproper efficiency.

The principal object of my invention is to provide a burner assembly andfirebox arrangement so constructed that all the burners may be withdrawnfrom or inserted in the firebox at one operation and with only theuncoupling of a single pipe union being necessary; and so that anyburner may then be removed from the assembly without disturbing theothers.

Another object of the invention is to provide a means, arranged as aunit with the assembly, for enabling the air supply to all the burnersto be adjusted simultaneously and to the same extent, so that flames ofequal volume and intensity will be created at all the burners. I havealso arranged a pilot light device as a unit and removable with a burnerassembly, so that this pilot will retain its desired position relativeto the burners at all times. The burner supporting element of theassembly is so constructed that it may be easily made in differentlengths, to accommodate a different number of burners as the depth ofthe firebox may require, without otherwise altering the design of said:element or any of the cooperating parts.

As a further object I have provided a means for enabling a certain typeof safety pilot (through the body of which all the gas passes beforereaching the burner, and whose passage is controlled by the heatgenerated by the pilot) to be used with my improved burner assembly orwith any gas burners of the Venturi air mixing type-something which hasnot been so far successfully or practically accomplished, to myknowledge.

A further object of the invention is to produce a simple and inexpensivedevice. and yet one which will be exceedingly effective for the purppsefor which it is designed.

These ob ects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of reference indicate correspondingparts in the several views:

Fig. 1 is a front end view of the firebox of the furnace, showing myimproved burner assembly installed in connection therewith.

Fig. 2 is an enlarged cross section of the firebox and burner assembly.

Fig. 3 is a fragmentary longitudinal sec. tion of the firebox showingthe burner assembly therein.

Fig. 4 is a fragmentary top plan view of the same, with the burnersremoved and with other parts broken away.

Fig. 5 is a front end of the firebox and blilllllel' assembly showing amodified form of p ot.

Fig. 6 is a fragmentary longitudinal section of the firebox showing themodified burner and pilot assembly.

Referring now more particularly to the characters of reference on thedrawings, and particularly at present to Figs. 1 to 4 the furnaceincludes a rectangular ielatively long or deep firebox, which is dividedinto an upper main fire chamber 1 and a lower and relatively narrow airchamber 2. From the sides of the main chamber 1, some distance above thebottom of the same, outlets 3 communicate with drums 4 as shown in saidcopending application.

The front of the firebox is provided with a rectangular opening of thsame width as the chamber 2 and extending upwardly from the bottom ofthe same to a point some distance above the top of said chamber. Thisopening is surrounded by a cast frame 5, on 5 the upper portion of whicha flap door 5a is hinged for upward swinging movement. The

bottom of the frame and the bottom of the firebox chamber 2 are providedfrom end to end with a rectangular trough 6 to slidably guide andsupport the gas manifold 7 which is of similar cross-sectional shape tosaid trough and which projects outwardly of the frame 5 a shortdistance. I

Projecting upwardly from and secured in the manifold at equally spacedpoints along the length of the same are gas jet nipples 8 whichremovably fit in and support the lower ends of Venturi pipes 9 of commonform. These pipes as usual swell outwardly at their bases where theysurround the jets and are there provided with curved-air slots 10.Shutters 11 provided with similar curved slots 12 to register with theslots 10 are turnably mounted in connection with the pipes. I This iscommon construction, as will be evident, and permits. air in varyingquantities to be drawn into the Venturi pipes to be mixed with the gasentering the same through the jets.

To enable all the shutters to be ad usted simultaneously and from theexterior of the firebox, said shutters are provided with radiallyextending ears 13 projecting laterally of the manifold and over which arod 1%, extending lengthwise of the firebox and manifold, extends. Thisrod has dependmg pins 15 detachably engaging holes in the ears, and atits outer end slidably projects through a boss 16 on the outer end ofthe manifold, and which as previously stated is outside the firebox. Aset screw 17 in the boss enables said rod to be easily clamped in anyposition to which it may be moved.

The boss is the only definitely fixed support or connection between therod and manifold, since toward its inner end the rod is supported byresting on the shutter ears. This permits any shutter to be readilydisengaged from the rod, when it is desired to remove the correspondingVenturi pipe, by merely flexing the rod upwardly and the rod-pin clearsthe corresponding ear.

The Venturi pipes project upwardly a short distance above the top of thechamber 2 and 'removably support burners 18 on their upper ends. Theseburners are of rectangular form, their width being somewhat less thanthat of the firebox 2 and frame 5 so that they may pass through thesame. The length of the burners is such that while the various burnersare separated from each other they are so close as to form in effect acontinuous burner unit. The burners-are below the level ofthe door 5a sothat the latter is not dis- 6 turbed in removing or inserting theburners and is merely for inspection purposes to enable the flame to beviewed.

The primary and main air for the burners is taken in through theopenings in the bottom of the Venturi pipes, to which air has freeaccess from the front of the firebox through the lower portion of theopening at the outer end of the same. .It is not desired that a largeamount of secondary air should have access to the flame itself, so thatan air restricting structure is employed to limit the passage of air tothe burners from around the same. This structure comprises a horizontalplate 19, substantially the same width and length as the chamber 2 andsecured in,

connection with the different Venturi pipes,

which project through said plate, by suitablycover plate 23 extendingfrom the plate 19 to the bottom of the door 5a. The portion of the vlower chamber 2 above the plate 19 is therefore shut off from air fromthe outside, except for such restricted air passages as will be shownlater. At the same time there is nothing to interfere with the readyremoval of the burner assembly since the plate 23 may be readily removedand the entire front opening is then unobstructed so as to permit of theoutward movement of the manifold burners and plate 19.

The plate 19 is provided with widely spaced holes 24; to admit air tothe fire chamber of the firebox from below. I may also provideadditional hol's 25 through the bottom late of the chamber 1 outwardlyof the lower c amber 2, which communicate with said lower chamber byholes 26 in the sides of the latter; diagonal walls 27 between the sidesof the chamber 2 and the bottom of the chamber 1 keeping the air outsidethe furnace from pass ing through said holes; f

At its outer end the manifold is connected by an L 28 with various pipefittings forming the main horizontal gas line. This line extends atright an les to the furnace and manifold and inclu es a main gas-cock29, a T 30 beyond the same, and a union 31 beyond the T detachablyconnecting the same with the remaining and permanently fixed pipe line32.

To ignite the gas flowing from the burner when the cock is opened a(pilot 33 ofsuitable character is positioned a acent one of the burners.From this pilot a supply tube 34: extends downwardly to the mamfold andthen along the same to and beyond its outer end, where it is connectedby a control cock 35 to the T 30. Where it extends along the manifold,above the trough 6 of the chamber 2, said tube 34 is secured in place bone or more upstanding lugs 36 formed on t e manifold and against whlchsaid tube is secured by clips 37. By reason of this construction it willbe seen that the pilot assembly is a unit with the burner assembly, andwhen it is desired to remove the entire structure it is only necessaryto disconnect the union, remove the plate 23 and withdraw said structurelengthwise or horizontally from the firebox.

In Figs. 5 and 6 I have shown an arrangement of parts which enables metouse the special form of safety pilot 38 instead of the ordinary typepreviously described. The

7 body of this pilot as constructed for my pur-.

pose is provided'with a downwardly projectmg tapped outlet passage 39and a horizontal outwardly projecting intake passage 40,,disposed infront of said passage 39. The main gas line L, 28a, instead of beingconnected to the outer end of the manifold 7 as was previously the case,is now connected to the passa e 40; while a vertical pipe 41 is connecteto and extends downwardly from the passage 39 and is connected to thetop of the manifold adjacent its outer end. The manifold is not changedfor either type of connection, being initially tapped both on top and atits outer end to receive the pipe fittings; the opening not being usedat the time being closed by a plug, as plainly shown. The jet tip T ofthe pilot is positioned so as to be adjacent the forward end of theforward burner.18, the plate 23a of the front frame being cut away toallow the body of the pilot to project partly through the same.Otherwise the construction and arrangement of the assembly is the sameas before and said assembl may be removed as a unit from the fireboxwithout disturbing the fpilot. The particular passage arrangement 0 thepilot however enables said pilot to be positioned the necessary distanceabove the main gas manifold so that it is practicable to use'the samewith burners of this character.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention as defined by the appended claims.

Having thus described my invention what I claim as new and useful anddesire to secure by Letters Patent is:

1. A gas burner assembly for a furnace firebox com rising a gas supplymanifold, a plurality o burners separately mounted on and along saidmanifold, means forslidably and removably supporting thev manifold inthe firebox, and a gas supply line extending the union and manifold andoutside the firebox whereby said pilot and its pipe are removable as' aunit with the manifold and a cortrol valve in said pipe adjacent itsouter en 3. In combination with a firebox having an at one end, a troughin the bottom opening p of the rebox extending into the same from.

the opening, a gas supply manifold slidable in and supported by saidtrough, and a plurality of burners mounted on said manifold in spacedrelation along the same; said burners havin a width and being positionedso as to enab e them to be removed as a unit with the manifold throughthe front end opening of the firebox. p

4. In combination with a firebox having an opening at one end, a gassupply manifold slidably supported on the bottom of the firebox andprojecting inwardly from the open-' ing, and a burner above and spacedfrom the manifold, but belowthe top of the opening, air and gas mixingpipes connecting the burner with the manifold, a horizontal plate fixedin connection with all said pipes on a level intermediate the burner andmanifold, said plate extending the full width and length of the fireboxand to the opening, and a vertical cover member removably secured overthe opening from the plate to the top of said openmg.

5. A structure as in claim 4, in which said plzlzte is provided with airopenings at interva s.

6. A structure as in claim l, in which said plate and firebox areprovided with cooperatmg guide and slide means along the sides of theplate.

7. A structure as in claim 4, in which the firebox, above said plate, iswider than the portion below the plate, and air passages are supportingsaid pilot, and a horizontal gas '4- 'eeemee int-eke pipe connecteoi tothe piiofi: in frontof we vertical pipe.

9.; In combination with a, firebox having an opening in one end, atrough in the bottom of the firebox extending into the same from theopening, the bottom of the trough at its outer end forming the bottom ofthe opening, and a gas supply manifold heaving an upstandingburnerthereon, slidahiy supported m on the trough.

10. In combination with e firebox; e gee burner therein above the bottomof the seine a mixing pipe depending from and supporting the burner,and; a horizontal pieee extend- 15 ing the full; Width and length of thefiiehox and disposed about the pipe intermediate the ends of the same,said plate having ail openings therethrongh, and the firebox below oheplate having openings to the atmosphere, 2e 11. A structure as in claim1G in which ed ditionell air openings, to the sides of the Make, areprovided in the firebox to provide for the passage of air from thefirebox area, heiow the ilate to the firebox area, above to 25 sides ofthe plate.

En testimony 'Whe eof I aiiix my signature.

- RKQJL-AAED 183 LASER.

